Sqlstate[hy000] [2002] connection refused, saat php artisan migrate pada laravel

Halo rekan2 semua, selamat pagi. saya kan baru mulai belajar laravel nih. ada yg bisa bantu, di folder migration laravel kan saya sudah buat 3 create yakni categories, post, dan comment. saat saya mau "php artisan migrate"

muncul error ini==>>

" SQLSTATE[HY000] [2002] Connection refused (SQL: select * from information_schema.tables where table _schema = blog and table_name = migrations) "